fix: update action versions in Nix build workflow (#78)

.gitignore

@@ -72,4 +72,11 @@ out
 result
 
 .claude/worktrees
-.claude/settings.local.json
+.claude/settings.local.json
+
+# Screenshots and Test Reports
+**/screenshots
+/test-results/
+/playwright-report/
+/blob-report/
+/playwright/.cache